Paper-cutter



Patented Oct. ll, I898. B. PIERCE.

No. 6l2,l20.

PAPER CUTTER.

(Application filed Apr. 80, 1897.)

(No Model.)

q UHI 1 woes UNITED STATES PATENT OFFICE.

ROSCOE PIERCE, OF SPRINGFIELD, OIIIO.

PAPER-CUTTER.

SPECIFICATION forming part of LettersPatent No. 612,120, dated October 11, 1898.

Application filed April 30,1897. fierial No. 634,502. (No model.)

To to whom, it may concern:

Be it known that I, Rosoon PIERCE, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Paper-Cutters, of which the following is a specification.

My invention relates to improvements in devices for cutting paper, my improved device being especially adapted for trimming the edges of wall-paper, window-shades, &c. I attain this object by the constructions shown in the accompanying drawings, in which Figure 1 is a side elevation of a device embodying my invention, illustrated as mounted on its guiding-strip, which is shown in section. Fig. 2 is a plan view of the cutter removed from the guiding-strip. Fig. 3 is a sectional view of the guiding-strip, showing the cutter in end elevation thereon. Fig. 4: is a transverse sectional view of the cuttingtool. Fig. 5 is a detail of cutter-shaft and adjustment.

Like parts are represented by similar letters of reference in the several views.

In constructing my improved cutter I employ a housing Ct, which is recessed, as shown at a, to receive the cutting-tool b, which is formed in the nature of a disk and is mounted on a shaft 17. This shaft Z) has a collar 6 between which and a clamping-nut the disk is securely held, so as to turn with the shaft 19.

The shaft 19' is mounted in an extended bearing a on the housing a. This bearing is preferably grooved and knurled on its outside, as shown at a so as to serve as a handle for operating the tool. The shaft 1) and the cutter I) mounted thereon are held in position in the bearing and the recessed housing, respectively, by a small retaining-screw b which engages with a circumferential groove 19 in the shaft 17. The shaft preferably extends entirely through the bearing a and is preferably slotted or otherwise formed at the end, as shown at b, so that it may be engaged by a screw-driver or other suitable holding-tool, while the nut 19 is tightened against the cutting-disk or cutter Z), so as to clamp the same firmly 011 the shaft. The collar b is preferably recessed into the end of the bearing'a as shown.

The above construction, it will be seen, gives a long bearing for the shaft 1), which is clamped to and forms in effect a part of the cutter b, so that all lateral or wabbling movement of the knife or cutter is obviated.

The housing ct is joined to the main frame or support 0 by a spring, which permits a yielding movement of the housing and knife with reference to said frame. This connection consists, preferably, of a plain flat spring 0', which is secured at one end to a projection a on the housing a and at the other to a corresponding projection 0 on the frame 0. The respective ends of this spring are preferably adapted to rest against shoulders c and a on the respective parts, so that a single fastening-screw c and a at each end may be employed to hold the parts firmly together, two such screws 0 being shown in the drawings. The housing a is preferably further attached to the frame a by means of a screw a which passes through a slotted opening a in an extension of the housing and screws into the frame 0, as shown at c. The housing a is preferably further provided with a curved lip or thumb-support a to receive the thumb of the operator in the manipulations of the device.

The frame 0 carries at the bottom guidingplates 0 each of which is preferably pro vided on one side with a removable flange c and a supporting-flange 0 The plate between these respective flanges is cut away and the flanges are beveled to form a dovetail slot 0 between the flanges, and this slot is protects said strip to a certain extent from injury in handling the same, while the depression 61 causes the straight-edge to adhere more closely to the surface of the paper or other substance acted upon- It will be understood that the dovetail grooves 0 in the bottom of the guidin g-plates c are fitted snugly to the guiding-plate 01, so that the tool is held in position on the straightedge at all times and can be removed therefrom only at the respective end of the straightedge. This guiding-plate (2 serves as the entire guide for the cuttingtool, the cutter or cutting-disk of which may run at a distance from the edge of the straight-edge, if desired. By this construction the guides or bearings resting against the front edge of the straightedge are obviated and all danger of the cutting-tool engaging with and cutting into the front of the straight-edge is obviated. By having the flange c removable the guidingplates may be fitted to the guiding-strip cl by adjusting the flange c to or from the guidingstrip, this being accomplished by filing or by the insertion of washers of paper or other substance in a well-known manner.

To provide for more ready access to the clamping-nut b of the knife I), I preferably form the frame 0 with a central opening 0 This permits access at all times to the clamping-nut b without removing the housing from the frame.

To provide for adjusting the cutter b and its shaft 1), so as to prevent longitudinal movement of the shaft, I preferably have the circumferential groove 12 in the shaft of a V shape in crosssection, or in any event with one beveled side. The retaining-screw b is formed beveled or conical on its end and is adapted to bear against the beveled side of the circumferential groove, as shown in Fig. 5, so that as the retaining-screw is moved out or in it permits more or less end movement of the shaft b and in connection with the collar 1) furnishes the means for adjusting the shaft to take up wear or otherwise an prevent end movement thereof.

ated on any desired thickness of material without previous adjustment, the parts returning to their normal positions as soon as released.

Having thus described my invention, I claim 1. In a cutting-tool, the combination with the frame having the guides, a housing arranged adjacent to said frame, said housing being recessed to receive a knife which is journaled therein, a laterally-projecting seat and a substantially straight flat spring secured to said seat and forming the entire support for said housing, and means for limiting the movement of said housing with reference to said frame, substantially as specified.

2. The combination with a frame having the guides, and a housing having a knife mounted therein, said frame and housing, respectively, having extended bearing-seats to receive the respective ends of a flat connecting-spring which forms the connection and support between said frame and housing, and means for limiting the movement of said housing with reference to said frame, substantially as specified.

3. The combination with the housing having the extended bearing formed on its exterior to form a handle, a shaft extending through said bearing and provided with a shoulder to receive said knife, and means for attaching said knife to said shaft to cause them to rotate together, a V-shaped groove in the periphery of said shaft, and a projection extending from said bearing against the beveled edge of said groove so as to hold said shaft against longitudinal movement in said bearing and provide means for adjusting the same, substantially as specified.

at. The combination with a cutting-tool having a yielding housing, and a frame with guiding plates or projections, a straight-edge having a groove or depression in the bottom and a corresponding elevation at the top, and a guiding rib or plate on the top of said straight-edge below the top elevation thereof, substantially as specified.

IIO

The operation of the device it is thought will be understood from the description. In trimming wall-paper or similar substance the straight-edge, with the cutter thereon, is laid on the substance to be trimmed on a suitable cutting-table and the handle a is grasped by the hand, with the thumb resting in the support a The housing is depressed by the operator, so as to move the housing and cutter downwardly against the material acted upon, this depression being effected by the yielding of the spring 0. The cutting-tool is then moved along the guiding-strip d and in contact with the material acted upon, so as to sever the same, the required pressure for this purpose being inserted onto the housing through the handle and thumb-support ed. The yielding of the housing with the supporting-frame permits the device to be opero. 1. he combination with the frame having the guiding-plates with the undercut inclined flanges, and the guiding-strip with which said guides are adapted to engage, a projection on said frame, a spring secured to said projection, a housing recessed to receive a cutter and having at one side a projection secured to said spring and at the other side a slotted opening to engage a projecting part on said frame, said cutter being mounted on a shaft which is journaled in a bearing in said housing, said bearing being extended from said housing and constructed 011 its periphery to form a handle, substantially as and for the purpose specified.

6; The combination with the frame having the guiding-plates and a housing having a cutter, aspring forming a supporting connection between said frame and housing, said guiding-plates having undercut flanges, and o a guiding-strip to fit in said guiding-plates,

one of said flanges being removable, substantially as and for the purpose specified. 5 7. The combination with the frame, a housing yieldingly mounted thereon, a cutter in said housing, a shaft mounted in a suitable bearing in said housing and supporting said cutter, aclamping-nut on said shaft to engage 

